!function(global,factory){"object"==typeof exports&&"undefined"!=typeof module?module.exports=factory():"function"==typeof define&&define.amd?define(factory):global.ResizeObserver=factory()}(this,function(){"use strict";function getHTMLElementContentRect(target){var rect=target.getBoundingClientRect();return createRectInit(rect.left,rect.top,rect.width,rect.height)}function getContentRect(target){return isBrowser?getHTMLElementContentRect(target):emptyRect}function createReadOnlyRect(ref){var x=ref.x,y=ref.y,width=ref.width,height=ref.height,Constr="undefined"!=typeof DOMRectReadOnly?DOMRectReadOnly:Object,rect=Object.create(Constr.prototype);return defineConfigurable(rect,{x:x,y:y,width:width,height:height,top:y,right:x+width,bottom:height+y,left:x}),rect}function createRectInit(x,y,width,height){return{x:x,y:y,width:width,height:height}}var MapShim=function(){function getIndex(arr,key){var result=-1;return arr.some(function(entry,index){return entry[0]===key&&(result=index,!0)}),result}return"undefined"!=typeof Map?Map:function(){function anonymous(){this.__entries__=[]}var prototypeAccessors={size:{configurable:!0}};return prototypeAccessors.size.get=function(){return this.__entries__.length},anonymous.prototype.get=function(key){var index=getIndex(this.__entries__,key),entry=this.__entries__[index];return entry&&entry[1]},anonymous.prototype.set=function(key,value){var index=getIndex(this.__entries__,key);~index?this.__entries__[index][1]=value:this.__entries__.push([key,value])},anonymous.prototype.delete=function(key){var entries=this.__entries__,index=getIndex(entries,key);~index&&entries.splice(index,1)},anonymous.prototype.has=function(key){return!!~getIndex(this.__entries__,key)},anonymous.prototype.clear=function(){this.__entries__.splice(0)},anonymous.prototype.forEach=function(callback,ctx){var this$1=this;void 0===ctx&&(ctx=null);for(var i=0,list=this$1.__entries__;i0},ResizeObserverController.prototype.connect_=function(){isBrowser&&!this.connected_&&(document.addEventListener("transitionend",this.onTransitionEnd_),window.addEventListener("resize",this.refresh),window.addEventListener("orientationchange",this.refresh),mutationObserverSupported?(this.mutationsObserver_=new MutationObserver(this.refresh),this.mutationsObserver_.observe(document,{attributes:!0,childList:!0,characterData:!0,subtree:!0})):(document.addEventListener("DOMSubtreeModified",this.refresh),this.mutationEventsAdded_=!0),this.connected_=!0)},ResizeObserverController.prototype.disconnect_=function(){isBrowser&&this.connected_&&(document.removeEventListener("transitionend",this.onTransitionEnd_),window.removeEventListener("resize",this.refresh),window.removeEventListener("orientationchange",this.refresh),this.mutationsObserver_&&this.mutationsObserver_.disconnect(),this.mutationEventsAdded_&&document.removeEventListener("DOMSubtreeModified",this.refresh),this.mutationsObserver_=null,this.mutationEventsAdded_=!1,this.connected_=!1)},ResizeObserverController.prototype.onTransitionEnd_=function(ref){var propertyName=ref.propertyName;void 0===propertyName&&(propertyName=""),transitionKeys.some(function(key){return!!~propertyName.indexOf(key)})&&this.refresh()},ResizeObserverController.getInstance=function(){return this.instance_||(this.instance_=new ResizeObserverController),this.instance_},ResizeObserverController.instance_=null;var defineConfigurable=function(target,props){for(var i=0,list=Object.keys(props);i0};var observers="undefined"!=typeof WeakMap?new WeakMap:new MapShim,ResizeObserver=function(callback){if(!(this instanceof ResizeObserver))throw new TypeError("Cannot call a class as a function.");if(!arguments.length)throw new TypeError("1 argument required, but only 0 present.");var controller=ResizeObserverController.getInstance(),observer=new ResizeObserverSPI(callback,controller,this);observers.set(this,observer)};return["observe","unobserve","disconnect"].forEach(function(method){ResizeObserver.prototype[method]=function(){return(ref=observers.get(this))[method].apply(ref,arguments);var ref}}),function(){return void 0!==global$1.ResizeObserver?global$1.ResizeObserver:ResizeObserver}()});